sunrpc/svc_auth.c

   1 /* @(#)svc_auth.c       2.4 88/08/15 4.0 RPCSRC */
   2 /*
   3  * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
   4  * unrestricted use provided that this legend is included on all tape
   5  * media and as a part of the software program in whole or part.  Users
   6  * may copy or modify Sun RPC without charge, but are not authorized
   7  * to license or distribute it to anyone else except as part of a product or
   8  * program developed by the user.
   9  *
  10  * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
  11  * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
  12  * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
  13  *
  14  * Sun RPC is provided with no support and without any obligation on the
  15  * part of Sun Microsystems, Inc. to assist in its use, correction,
  16  * modification or enhancement.
  17  *
  18  * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
  19  * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
  20  * OR ANY PART THEREOF.
  21  *
  22  * In no event will Sun Microsystems, Inc. be liable for any lost revenue
  23  * or profits or other special, indirect and consequential damages, even if
  24  * Sun has been advised of the possibility of such damages.
  25  *
  26  * Sun Microsystems, Inc.
  27  * 2550 Garcia Avenue
  28  * Mountain View, California  94043
  29  */
  30 #if !defined(lint) && defined(SCCSIDS)
  31 static char sccsid[] = "@(#)svc_auth.c 1.19 87/08/11 Copyr 1984 Sun Micro";
  32 #endif
  33
  34 /*
  35  * svc_auth.c, Server-side rpc authenticator interface.
  36  * *WITHOUT* DES authentication.
  37  *
  38  * Copyright (C) 1984, Sun Microsystems, Inc.
  39  */
  40
  41 #include <rpc/rpc.h>
  42 #include <rpc/svc.h>
  43 #include <rpc/svc_auth.h>
  44
  45 /*
  46  * svcauthsw is the bdevsw of server side authentication.
  47  *
  48  * Server side authenticators are called from authenticate by
  49  * using the client auth struct flavor field to index into svcauthsw.
  50  * The server auth flavors must implement a routine that looks
  51  * like:
  52  *
  53  *      enum auth_stat
  54  *      flavorx_auth(rqst, msg)
  55  *              register struct svc_req *rqst;
  56  *              register struct rpc_msg *msg;
  57  *
  58  */
  59
  60 static enum auth_stat _svcauth_null (struct svc_req *, struct rpc_msg *);
  61                                 /* no authentication */
  62 extern enum auth_stat _svcauth_unix (struct svc_req *, struct rpc_msg *);
  63                                 /* unix style (uid, gids) */
  64 extern enum auth_stat _svcauth_short (struct svc_req *, struct rpc_msg *);
  65                                 /* short hand unix style */
  66
  67 static const struct
  68   {
  69     enum auth_stat (*authenticator) (struct svc_req *, struct rpc_msg *);
  70   }
  71 svcauthsw[] =
  72 {
  73   { _svcauth_null },            /* AUTH_NULL */
  74   { _svcauth_unix },            /* AUTH_UNIX */
  75   { _svcauth_short }            /* AUTH_SHORT */
  76 };
  77 #define AUTH_MAX        2       /* HIGHEST AUTH NUMBER */
  78
  79
  80 /*
  81  * The call rpc message, msg has been obtained from the wire.  The msg contains
  82  * the raw form of credentials and verifiers.  authenticate returns AUTH_OK
  83  * if the msg is successfully authenticated.  If AUTH_OK then the routine also
  84  * does the following things:
  85  * set rqst->rq_xprt->verf to the appropriate response verifier;
  86  * sets rqst->rq_client_cred to the "cooked" form of the credentials.
  87  *
  88  * NB: rqst->rq_cxprt->verf must be pre-allocated;
  89  * its length is set appropriately.
  90  *
  91  * The caller still owns and is responsible for msg->u.cmb.cred and
  92  * msg->u.cmb.verf.  The authentication system retains ownership of
  93  * rqst->rq_client_cred, the cooked credentials.
  94  *
  95  * There is an assumption that any flavour less than AUTH_NULL is
  96  * invalid.
  97  */
  98 enum auth_stat
  99 _authenticate (register struct svc_req *rqst, struct rpc_msg *msg)
 100 {
 101   register int cred_flavor;
 102
 103   rqst->rq_cred = msg->rm_call.cb_cred;
 104   rqst->rq_xprt->xp_verf.oa_flavor = _null_auth.oa_flavor;
 105   rqst->rq_xprt->xp_verf.oa_length = 0;
 106   cred_flavor = rqst->rq_cred.oa_flavor;
 107   if ((cred_flavor <= AUTH_MAX) && (cred_flavor >= AUTH_NULL))
 108     return (*(svcauthsw[cred_flavor].authenticator)) (rqst, msg);
 109
 110   return AUTH_REJECTEDCRED;
 111 }
 112
 113 static enum auth_stat
 114 _svcauth_null (struct svc_req *rqst, struct rpc_msg *msg)
 115 {
 116   return AUTH_OK;
 117 }